A system and method are provided for a feed-forward control of an inverter to reduce, and potentially minimize, a DC link capacitor of a wireless power transfer system. The feed-forward control may be utilized to reduce the capacitance of the DC link capacitor in a single-phase series-series compensated WPT system.
Legal claims defining the scope of protection, as filed with the USPTO.
2. The WPT system of claim 1, wherein the control circuitry comprises a microcontroller configured to implement the relative phase shift a(t) that varies nonlinearly with the DC voltage signal VDc(t).
3. The WPT system of claim 1, wherein the relative phase shift a(t) is based on a target amplitude Vf of the fundamental component of the high-frequency AC voltage.
4. The WPT system of claim 3, wherein a frequency of the fundamental component of the high-frequency AC voltage is 22 kHz or 85 kHz.
5. The WPT system of claim 1, wherein, for a WPT system power rating of 100 kW, and for a DC voltage with a nominal value in a voltage range of 350-800 V and a ripple of ±10%, capacitance of the DC-link capacitor bank is in a capacitance range of 2-4 mF.
6. The WPT system of claim 5, wherein the DC-link capacitor bank comprises 10-20 film capacitors each having a capacitance of about 220 μF.
10. The system of claim 8 wherein the characteristic of power of the DC power is a DC voltage of the DC power received by the switching circuitry.
11. The system of claim 8 comprising power supply circuitry operable to receive AC power, the power supply circuitry operable to generate the DC power based on the AC power.
12. The system of claim 11 wherein the phase relationship between the first and second drive signals is varied nonlinearly as a function of the characteristic of power of the DC power sensed by the sensor with respect to the DC power received by the switching circuitry.
13. The system of claim 8 comprising the receiver operable to receive the power inductively transferred from the transmitter, wherein the receiver is provided in the remote device and operable to supply the power to a load of the remote device.
15. The wireless power supply of claim 14 wherein power supply circuitry is operable to receive AC power, the power supply circuitry operable to generate the DC power based on the AC power.
16. The wireless power supply of claim 15 wherein the phase relationship between the first and second drive signals is varied nonlinearly as a function of the characteristic of power of the DC power sensed by the sensor with respect to the DC power received by the switching circuitry.
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March 8, 2021
January 17, 2023
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